Update test files with refinements and fixes

- test_anime_endpoints.py: Minor updates
- test_download_retry.py: Refinements
- test_i18n.js: Updates
- test_tmdb_client.py: Improvements
- test_tmdb_rate_limiting.py: Test enhancements
- test_user_preferences.js: Updates

tests/unit/test_user_preferences.js

@@ -3,7 +3,7 @@
  * Tests preference storage, loading, and application
  */
 
-import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
 
 describe('UserPreferences', () => {
     let originalLocalStorage;